Check valve manufacturers share common check valve types

　Check valve refers to a valve that is composed of a circular valve disc and acts to block the backflow of the medium through its weight and medium pressure. It is an automatic valve, also known as a check valve, check valve, return valve or isolation valve. Check valve manufacturers share the following types of common check valves.

Check valve manufacturers

1. Lift check valve: vertical and horizontal. Lift check valves have the same body shape as globe valves, so the fluid resistance is greater, and the disc slides along the vertical center line of the body. When the medium flows downstream, the piston valve is opened by the push force of the medium, and when the medium stops, the piston valve is lowered in the valve by self-drooping

1. Column type drawdown check valve. The orientation of the medium inlet and outlet pipeline is consistent with that of the valve block pipeline, and the flow obstruction is smaller than that of the direct connection. The column lift system check valve is installed in the vertical line.

2, the directly connected lifting system check valve can only be assembled in the overall horizontal pipeline. Limited by assembly requirements, it is more commonly used in small aperture public occasions DN<50.

1. Rotary check valve: The piston valve of rotary check valve is a round wheel, and the rotating shaft of the valve block is turned over. Mainly because the pipeline in the valve is streamlined, the flow obstruction is smaller than the drop check valve, and it can be used for small diameter, low pressure and large diameter pipelines, low flow speed and large diameter public places where the flow does not often change.

1. Rotary check valves are divided into single, double and half three kinds. These three forms are mainly separated by valve diameter. The purpose is to prevent the medium from stopping or backflowing to weaken the hydraulic shock. Single disc rotary check valves are usually suitable for medium calibers. In order to reduce the water hammer pressure, it is recommended to use a slow closing check valve that can reduce the water hammer pressure when selecting a single flap swing check valve for large diameter pipelines. Double disc rotary check valves are suitable for large and medium diameter lines. Double-disc swing check valve with small structure and light weight is a rapidly developing check valve. Multi-disc swing check valves are suitable for large diameter lines.

1. The installation position of the rotary check valve is not limited, and can be installed on horizontal, vertical or inclined pipelines.

Three, butterfly check valve: straight through. The structure of the butterfly check valve is similar to that of the butterfly valve, which has a simple structure, small flow resistance, small water hammer pressure, and a check valve with the disc rotating around the seat. The disc check valve is simple in structure, can only be installed on the horizontal pipe, and has poor sealing.

Fourth, diaphragm check valve: has a variety of structural forms, all use diaphragm as a closure. Due to its good waterproof hammer performance, simple structure and low cost, it has developed rapidly in recent years, but the temperature and pressure of the diaphragm check valve are limited by the diaphragm material.

Check valve manufacturer summary: diaphragm check valve is suitable for easy to produce water strike on the pipeline, the diaphragm can well eliminate the water strike generated when the medium countercurrent, it is generally used in low pressure normal temperature pipelines, check valve manufacturers recommend: Especially suitable for water pipes, the general working temperature of the medium is between -12--120℃, and the working pressure is <1.6MPa, but the diaphragm check valve can achieve a larger diameter, and the DN can reach more than 2000mm;